code: def __init__(self, ohem_ratio=3.0):
      super().__init__()
      self.ohem_ratio = ohem_ratio
      self.downsample_ratio = 1.0
  
file_path: PaddleOCR/ppocr/losses/det_drrg_loss.py
imports: import paddle
  import paddle.nn.functional
  from paddle import nn
label_desc: Use image node_id 1 to create a new DRRGLoss object from inherited base classes: nn with example: obj = DRRGLoss(ohem_ratio)